Shaft distortion measuring unit using strain gauges - mounted on rotating shaft and linked to static indicating equipment via FM radio link for detection of torsion, compression or bending

摘要

Two clamps are mounted around the shaft at a distance from each other. At least one deformable strip (3) is secured at its ends to the clamps. In the centre of the strip, the strain gauges (4a,4b,4c,4d) are moutned on the rounded end (16) of two loops (5) which form an H-shaped distortable section, due to a cross-piece (6) between them. One end of the strip (7) is linked to the cross-piece (6) while the outer sides of the loops are linked to the other end (9) via the tines (8) of a fork-shaped section. The stain gauge bridge output is modulated and transmitted to a static demodulator and indicator unit. Compression and bending can be detected if a strip is used in which the H-shaped section is at right-angles to the shaft.